NOTE: Middle initial is given as "G" on stone and "T" in other records

His death day is the 1st in CA death index and 6th in military records

It appears clear that the marker is in error, and that it should read, "William T. Collins, died 10/1/1906" 

 U.S., Veterans' Gravesites, ca.1775-2019

Name William G Collins

Rank Major

Death Date 6 Oct 1906

Interment Place Los Angeles, California, USA

Cemetery Address 950 South Sepulveda Boulevard

Cemetery Postal Code 90049

Cemetery Los Angeles National Cemetery

Section 14

Row A

Plot 11

War Civil War

Branch of Service US Army

Relative William G Collins

Comments Veteran (Self)

 California, U.S., Death Index, 1905-1939

Name William T Collins

Birth Year abt 1838

Death Date 1 Oct 1906

Age at Death 68

Death Place Los Angeles, California, USA

William T. Collins graduated from the Medical Department of Georgetown College in Washington, D. C., the commencement taking place on March 2, 1865, at Ford's Theater. Public Service: Adjutant General of the Grand Army of the Republic in Washington, D. C.; mayor of Grand Forks, N. D.; first president of the University of North Dakota Board of Regents; Dakota Territorial Legislature, 1887; Representative from Park County, 4th Montana Legislative Assembly, 1895. (Major) Aide-de-camp Berdan's 2nd Regiment; physician and surgeon. Second marriage to Hattie L. Wood, May 2, 1877, at Fairhaven, Stearns County, Minnesota. 

~~~

The Fargo Forum and Daily Republican, Fargo,

ND / 16 October 1906, Image 12:

The Daily Outlook of Santa Monica, Cal., pays a high tribute to the worth of Dr. W. T. Collins, who recently passed away in that city. Dr. Collins was a pioneer at Grand Forks, and was a member of the territorial council in 1887; soon after this he went to Montana, and for some years was the physician in charge of the sanitarium at Hunter's Hot Springs. He served with distinction in the army and was major in the Berdan sharpshooters, being seriously wounded at the second battle of Bull Run, which made him a cripple for life. At his request he was buried in the beautiful cemetery at the California soldiers home, though not an inmate, of that institution. His many old friends in this state will regret to learn of his demise. 

~~~

The Irish Standard, Minneapolis, MN

6 October 1906, Image 5:

Dr. William T. Collins, age 68 years, cousin of Judge L. W. Collins of Minneapolis, died Monday in Santa Monica, Cal. Dr. Collins came to Minnesota in 1854, with his father, from northern Ontario, settling at Eden Prairie. He enlisted in Company A, Second regiment, Berdan's sharpshooters, in 1861; was wounded in the leg at Rapahannock station in 1863 and suffered three amputations. As he was unable to wear an artificial leg, he went on crutches until about ten years ago, when rheumatism compelled him to take a chair. He practiced medicine at St. Cloud, Minn.; Grand Forks, N. D., and Hunter's Hot Springs, Mont., moving to Santa Monica six years ago.