A reserve reconnaissance commander was found dead in his California home earlier this month.

The Corps was informed of the passing of Lt. Col. Adam L. Collier, commanding officer of 4th Reconnaissance Battalion based in San Antonio, on March 11, Military.com reported Wednesday.

Officials with the Los Angeles coroner’s office have ruled the incident a suicide following an investigation by the Hermosa Beach, California, police department.

“We extend our deepest condolences to the family and friends of Lt. Col. Adam Collier,” Marine spokeswoman 1st Lt. Stephanie Leguizamon said in a statement to Military.com. “The Marine Corps stands ready to support them in every way we can during this difficult time.”

Collier, 42, entered the Corps in 1998, and had deployed to Kuwait, Iraq and Afghanistan.