Officers tell ABC7 News they found the body of 50-year-old Troy Edward Nosenzo in his car Saturday morning off Highway 129, west of Highway 101 in San Benito County.
The cause of death is believed to be an overdose of sleeping pills.
54-year-old Patricia Nosenzo was found dead inside the couple's home on Evangeline Drive Friday morning.
Police say they previously had many trips to the home for domestic violence calls.
San Jose police spokesman Sgt. Jason Dwyer says Troy had prior contact with police, with officers having been called to the home twice before, "There was a history there, there was a pattern there," Dwyer said of previous police calls to the home.
According to Dwyer, Nosenzo had not been arrested previously at the home because his suspected actions did not rise to a "criminal level."
The killing was the 41st homicide of the year in San Jose, surpassing the 40 homicides in the city last year.
(The Associated Press contributed to this report)