New information surrounds the murder of a man found dead in his yard last summer near Northwest 150th and Western.
One suspect has yet to be caught and new court documents show the victim was under investigation for drug trafficking.
Investigators said the victim was the mastermind of a network of dealers trafficking high grade marijuana. Inside Lam's home they say they found drugs, cash and guns.
Surveillance video from June 24, shows five men entering Tuan Lam's house -- at least one of them armed.
Shadows on the wall show the suspects walking throughout the house.
That night, neighbors remember hearing three shots and when police arrived Lam was found dead in his front yard.
Mikecala Goosby, David Love, Devon Shaw and Steavquann Orange have all been charged with first-degree murder and robbery with a firearm in the death of 37-year-old Lam.
But new court documents state, Lam and his wife were "supplying violent metro gang members" with drugs and guns.
Through a search warrant, investigators found several guns, more than $65,000 in cash, nearly 200 pounds of high grade marijuana, ammunition, and magazines.
Court documents allege those items were part of Lam's drug trafficking business.
Initially, police thought the suspects who broke into Lam's home where there "to rob him of money and marijuana".
But one of Lam's former partners later told police Lam's death was the result of retaliation.
The man told a detective "Lam's sister was shot in the leg and that Tuan Lam had some guys go shoot up the guys that were responsible".
After Lam's death, investigators said his wife continued the "drug trafficking activity" and is now romantically involved with other "high level drug dealers."
Oklahoma City police say they're still looking for the 5th suspect seen in the surveillance video.