A man who was found dead Wednesday under potentially suspicious circumstances in a Morena-area neighborhood had an on-the-job accident the day prior, a friend told NBC 7.

The body was discovered at about 7 a.m. Wednesday in a parked truck in a construction zone in the 1000 block of Donahue Street, just north of Friars Road and east of Napa Street, according to the San Diego Police Department.

The man appeared to have suffered some sort of traumatic injury of unknown origin, SDPD Officer Colin Steinbroner said early on Wednesday.

A friend of the victim named Jose Luis Salazar, who told NBC 7 it all started Tuesday evening when they came together to finish up a water sealant job in a unit at an apartment complex, said he stayed in the truck while his friend worked.

The worker tried to climb a ladder while carrying a vacuum, but he lost his balance and fell off it, according to Salazar.

“He injured his wrist, and he hit himself in this part of his face, and he started bleeding,” Salazar said.

Salazar said he helped him get up on his feet, but his friend said he felt a lot of pain in his wrist and waist. That’s when his friend asked to go back to his truck to get some rest because he felt very tired

Salazar told NBC 7 that at 5:30 a.m. on Wednesday, his friend, who was not well, took a very deep breath and that it appeared as if he had fallen asleep, but he didn’t move afterward and died.

Salazar said neighbors came out soon afterward and called 911.