Ed Winters of the coroner's office said the body was an adult male, and it was wrapped and decomposed. The victim has not yet been identified.
Crews started digging at the home on the 4800 block of 112th Street in Lennox early in the morning, looking for a body.
The residents of the home, James and Gabriela Stein are missing. James Stein, 53, was last seen by his mother on December 9 and was reported missing 8 days later. Gabriela Stein, who is 5-feet tall and weighs 125 pounds, was last seen in early January.
Another man who has not been identified was staying at this house on January 12 when two people showed up and asked to borrow the man's truck.
"When the resident asked why he wanted to borrow the truck, they said to move a couple bodies," said Lt. Don Slawson of the L.A. County Sheriff's Homicide Bureau.
When the man said he wanted no part of it, the suspects bound the man, Slawson. The unidentified man was able to escape and went to police.
Police say 36-year-old Marcos Lomeli and 22-year-old Jenny Salazar took off in the truck. Lomeli and the truck have not been seen since. He was described as 5-foot-8 and 170 pounds. The truck is a beige 1984 Chevy long bed with license plate 3T55454.
Jenny Salazar was taken into custody on Monday, and when she was being interviewed, she told police that there was a body buried in the backyard, Slawson said.
Neighbors say the home has been known as the crazy house or drug house for years. A man named Carlos said he's called the sheriff's department for 20 years about the house.
"This place should've been torn down or erased off the map quite some time ago. There have been numerous overdose deaths at this home, there have been numerous crimes taking place at this home, but yet, every time the sheriff's department comes here, there's nothing that seems to turn up," he said.
Police say Marcos Lomeli is considered armed and dangerous. Anyone who sees him or has information is urged to call Crimestoppers at (800) 222-TIPS.