Robert Dewey Hoskins, who served a 10-month prison sentence for stalking and threatening Madonna in 2005, is on the loose after escaping from a Los Angeles mental hospital.

Hoskins, 54, walked away from Metropolitan State Hospital in Norwalk on Feb. 3, according to a KCAL9 report.

When he is not taking his medications, he is extremely psychotic and very violent, LAPD officer Karen Rayner told KCAL9.

Because of the level of psychosis he always has the potential to become violent, Rayner cautioned.

The LAPD refused to comment on how Hoskins escaped or explain why the hospital waited several days to report the incident.

Hoskins was sentenced to 10 years in prison in 1995 after trespassing at Madonna's Hollywood Hills home and threatening the pop star and her employees.

According to an account published by Los Angeles District Deputy Attorney Rhonda Saunders,  Hoskins scaled a wall surrounding Madonna's home on three separate occasions beginning in the spring of 1995. The third time, Hoskins threatened to kill a bodyguard, Basil Stephens. After a struggle over the bodyguard's gun, Stephens shot Hoskins twice in the abdomen, and he was taken into custody.

Hoskins was put on trial and found guilty of stalking, assault, and making terrorist threats.  While on trial, he vandalized his cell with messages about Madonna, but when confronted by a sheriff's deputy about the graffiti, he blamed Madonna for writing the messages and said he was going to slice the lying bitch's throat from ear to ear.

Hoskins has also made threatening statements about slitting Halle Berry's throat.

The LAPD told the Los Angeles Times that Hoskins had an unspecific run-in with law enforcement after being released from state prison, which led to his incarceration at Metropolitan State Hospital.

Madonna has reportedly been informed that Hoskins is on the loose, but has not made a public comment.

Law enforcement officials warn that Hoskins is extremely dangerous and that anyone who believes they see him should contact authorities immediately and avoid engaging him directly.