OAKLAND, Calif. (KRON) – A body was discovered in the wall of an old convention center in Oakland, according to the Alameda County Sheriff’s Office.

The Public Information Officer, Lt. Ray Kelly, confirmed with KRON4 that a decaying body was found in a wall being renovated at the old Henry J. Kaiser Convention Center on Wednesday.

Contract workers found the body around 1 p.m., according to Lt. F. Shavies.

Authorities said the body had been there for three to five years, but did not have a specific time.

Lt. Shavies shared an update on Twitter saying the body is believed to be an adult male.

He said the body was found behind drywall between two concrete pillars.

“Markings and biological evidence at the top of the opening indicate the victim may have been deceased near the top and over time, his body slowly decayed and slipped to the bottom of the cavity space,” Lt. Shavies said.

There was no sign of foul play or trauma.

It appears that this was an accidental death. Further information on the cause of death and identification will be released by the coroners at a later time.

No other details have been released at this time.

Anyone with information is asked to contact the Homicide Section at (510) 238-3821 or the TIP LINE at 238-7950.