Jose Parra, 35, was shot and killed Monday night in his home near Arcadia.
Parra, his wife and three young children had just arrived at home when they were ambushed by the suspect.
Parra handed over $1,800 but was still shot and killed.
The suspect is described as a Hispanic man in his early 20s, with light complexion, about 5 feet 7 inches tall, weighing about 150 pounds with a Band-Aid under his eye.
If you have any information regarding this incident, you're urged to call the Los Angeles County Sheriff's Homicide Bureau at (323) 890-5500.