Llewellyn L. Felker was born in Barton, Vermont to John and Lucina (Welch) Felker; both of Canada. His siblings were; Sadie, Albert, John, Zabriska, Louisa, Anna, and Mabel. He also had a half-sister, Mary Alice, from his father's first marriage.

In 1894 at the age of 17, he traveled to Seattle to live with his brother, Albert and sister-in-law, Katie. 

In 1895, Felker entered the U.S. Navy at Tacoma, WA. While in the Navy, he trained as an electrician. In 1898, he served in the Spanish-American War and was employed on the Battleship Monterey.

Following his military service, Felker left Washington state and headed for Butte, Montana where his mother, sister, Sadie, brother-in-law, John V. "Jack" Cunningham, and his two nephews lived.

On December 14, 1900, Llewellyn Felker was arrested after he shot and killed his brother-in-law, Jack Cunningham with a 38-caliber revolver.

Butte Police responded to the scene interviewing Felker, his mother, and a 3rd party custodian, Charles S. McKinstry, who accompanied Cunningham to his wife's house. Felker said that Cunningham had spent the last 2 weeks in jail for assaulting his sister and he assumed he would show up at her house.

Felker told police that he witnessed Cunningham pull a knife out while sitting next to Sadie who was ill in bed. McKinstry stated that he didn't see a knife being pulled, but that later he noticed a knife on the bedroom floor. McKinstry added that when Cunningham leaned towards his wife to whisper something to her, Felker fired four shots at him. A neighbor who heard the commotion responded and went for police.

Llewellyn Felker was booked into the Butte Jail, charged with First Degree Murder.

On March 11, 1901, the trial began and on March 15, 1901, the jury found Felker guilty.

On December 9, 1901, Felker attempted a jail break. He began lowering himself from the window using wool blankets he had woven into a 4-ply rope. As he lowered himself 35' from the ground, he was met by Deputy Sheriff Fitzsimmons who helped Felker the rest of the way down. Fitzsimmons escorted him back to his cell.

Felker had somehow obtained a steel saw and a loaded revolver which were found in his possession. The items were secured and placed into evidence.

On March 15, 1902, Felker's attorney asked for a new trial believing that Montana State Prosecutors failed to instruct the jury properly on the various charges available for them to consider.

Unwilling to wait for a new trial, on August 9, 1902, Felker again escaped from the Butte County Jail, this time accompanied by several other inmates. One inmate was soon captured, but Felker and the others made a successful getaway.

Just over a month later, on September 13, 1902, Felker walked into the Butte County Jail and turned himself in. He told the sheriff he had fled to Hood River in Oregon for fresh air and to get some fishing in. He said that he never visited his mother after escaping, believing he would be easily caught. Authorities did not believe the fishing story and it was their belief he had been at his mother's house in Butte all along. Felker was transported to the Montana State Prison in Deer Lodge.

In November of 1903, Felker's original charge of Murder was reduced to Manslaughter. On June 21, 1904, Felker was acquitted by a Grand Jury in Helena and was released from prison: 

• An article in the Anaconda Standard stated that reason for acquittal was that Felker's attorney argued the fact that the photos shown to jurors of knife marks and cuts on Cunningham's body during the trial were not made by Felker. The D.A. claimed that he never fed the jurors with erroneous information. Felker's attorney successfully argued that the cuts had been made by a surgeon at the hospital in Butte during an autopsy on Cunningham's body.  In addition, a Grand Jury in Helena learned that the same state D.A. purposely left the photos in a wide open desk drawer within the Jury Deliberating Room where they were sitting. The jurors said that they examined the photos and discussed them, believing they were left for them to review. The D.A. in question claimed that he had securely locked the photos up, but every juror denied his claim.
• The Butte Inter-Mountain newspaper reported on 19 AUG 1901 that the D.A. had been charged with Perjury, was fired from the state, and was facing charges.

In August of 1905, Felker left Montana and headed for Walsenburg, Colorado. There, he met and married Miss Anna Goodman. 

In December of 1906, Felker and his wife moved to Trinidad, CO and later to Arrowhead, CO. There he made the acquaintance of Columbus Clinton "C.C." Heskett. Heskett was preparing to serve a jail term for check forgery. Felker assured him he would keep an eye on his wife for him.

While Heskett was serving time, Felker ran off with Heskett's wife, Sarah Isabella (Peterman) Heskett, leaving his young bride, Anna, behind.

In June of 1907, Llewellyn Felker and Sarah Heskett were arrested in Arrowhead for Disorderly Conduct after becoming intoxicated.  Later that month, the two left Colorado and spent a brief time in New Mexico before settling in Nevada. They initially lived in Fallon in Churchill County, before moving to Rhyolite in Nye County. While there, Felker took on the alias of "Fred Skinner". 

Felker (Fred Skinner) began making a living as a gambler, while Sarah assumed the name of "Mona Bell" and began working in the tenderloin section of the red light prostitution district.

In late summer of 1907, Felker (aka Skinner) was arrested for assaulting a Judge in Rhyolite. He spent several months in jail in Tonopah (99 miles N. of Rhyolite). Sarah "Mona Bell" continued living and working in Rhyolite, and communicated by Felker (aka Skinner) by mail.

On January 5th, 1908, Felker, aka Fred Skinner, highly intoxicated, was arrested for murdering Sarah Isabella Heskett by shooting and killing her outside of their home in Rhyolite following a verbal dispute.

Felker, aka Skinner, was charged with 1st Degree Murder. The trial began on February 20, 1908 in Tonopah. On March 30, 1908, the Jury found him Guilty and he was booked into the State Prison in Carson City.

Anna (Goodman) Felker, the wife that Felker had left in Colorado, moved to Carson City, Nevada taking a job as a waitress. She began visiting Felker in prison and promised to stand by him during his incarceration. In 1911, Goodwin told her husband she had met another man who she planned to marry and she filed for divorce. Anna (Goodwin) Felker later married Jessie Delaney Hodges and moved to Kansas.

On September 30, 1912, Felker made an escape from the State Prison in Nevada. He had listed his sister in Butte, Montana as his emergency contact using the name of Fred Skinner on his contact card. The Nevada State Prison contacted authorities in Butte, sending photos of him and asking if they had information on a Fred Skinner. The Butte, Montana Jail and the Deer Lodge Prison shared all of Llewellyn L. Felker's records with Nevada State Prison, including the details of his two escapes while imprisoned there. This was likely the first time Nevada authorities learned of Felker's true identity.

On October 12, 1912, Felker was arrested at his sister, Mabel O. Felker's house in San Francisco. 

Llewellyn's sister-in-law, Katie Felker of Seattle, forged a telegram sent to the Nevada State Prison in the name of Mabel O. Felker. The telegram indicated that Llewellyn Felker, known to Nevada authorities as Fred Skinner could be found at her home in San Francisco. Felker was apprehended without incident in front of Mabel's house. Mabel was upset to learn that her name had been forged and stated she would have never turned her brother over to authorities. 

After being taken into custody, Felker bragged that he had killed 15 to 20 people. The Assistant DA doubted Felker's statement, but told him he wouldn't be surprised if there were other victims they didn't know about.

Felker was booked into prison on October 14, 1913. His first chance at parole was in 1917 and it was denied.

In 1920, he again faced the parole board, and again parole was denied.

In November of 1924, the Nevada State Prison granted parole to Llewelyn Felker on the condition that he reside with his brother, Albert, at his home in Los Angeles. 

In May of 1928 Llewellyn met and married Miss Ruth A. Russell. Ruth was originally from Oklahoma and was living in Los Angeles.

Llewellyn and Ruth moved from Los Angeles to Las Vegas where he resumed gambling and joined a large bootlegging ring. Additionally, he took on a new alias of "Doc Russell". 

In December of 1937, Felker, aka "Doc Russell" was arrested for Bootlegging and fighting. A witness, 18-year old Mary Ann Kirkland, stated she was employed at Doc Russell's home, and that he was running two large stills out of his home. She also gave the names of others involved in the ring and their locations. Felker was jailed for an undetermined length of time. While incarcerated, his wife filed for, and was granted a divorce. In 1938, Ruth married Lex James Walker and they settled in Orangevale, California.

For the next 24 years, Llewellyn Felker traveled between Nevada, Wyoming and Montana with the majority of time in spent in Reno.

In mid-May or 1962, Felker traveled to Vancouver, Washington to the Veteran's Hospital to seek medical attention. After running some tests, he was admitted to the hospital. On May 31, 1962 Llewellyn Felker died in the VA Hospital of Pulmonary Abscesses. 

He was buried in Evergreen Memorial Gardens in Vancouver, Washington.