This from the LADN:

SHERMAN OAKS – A man whose body was found with a gunshot wound to the head Sunday in a car on the Ventura Freeway was despondent over the suicide of his girlfriend and might have killed himself, police said this morning.

Marlon Gordillo Sical, 20, had been arguing with his girlfriend, Virginia Castillo, 19, when he disappeared and she hanged herself, police said.

“He was apparently despondent,” said Los Angeles Police Capt. James Miller, adding that police still are calling the case an undetermined death until the results of an autopsy tomorrow.

Miller would not say whether police found a gun at the scene of the accident Sunday but said no suicide note was found.