Last week, Locklear was arrested for allegedly almost biting her boyfriend's nose off in a drunken rage, and then attacking three cops who came to break up the fight. During the arrest, Locklear reportedly became "combative" and allegedly struck three officers.
The actress was arrested at her home February 25 on suspicion of felony domestic battery and three counts of battery on a peace officer.
TMZ reports cops were looking for a weapon for several hours on Tuesday, but were unable to come up with anything. Investigators discovered that Locklear had a gun registered in her name, but no gun was found during Tuesday's search.
At the time of Locklear's arrest, a police spokesperson said the 56-year-old actress was "uncooperative" and "battered". We're told she is now in a medical treatment facility. "Now I am working on tying up some loose ends regarding certain issues so I can hit 2017 full steam ahead", Locklear told the New York Post through her representative at the time.
Heather's daughter, Ava, has allegedly been pushing her mother to get treatment.
"[She's] blaming her brother for making the call to the police", the source claims.
Sources close to Locklear have said that she was "spiraling out of control" ahead of the incident.
He added: "I don't know when she got the handgun, but I do know that yes, she did make that statement to the police the night that she was arrested". She posted $20,000 bail and was released the following day.