A 76-year-old Connecticut man has been arrested after authorities discovered he was released from a mental hospital in 1992 after being found incompetent to stand trial for a 1991 murder.

Prosecutors say they should have been notified 18 years ago when Pedro Custodio was released from a state hospital in Newtown. Authorities had expected Custodio to be committed to the hospital for much longer.

A judge had asked about the status of the case this month because it had been open for almost two decades. Custodio was arrested Monday and ordered held on $200,000 bail during a court appearance Tuesday.

Custodio's sister tells the Republican-American newspaper that the state approved his release from the hospital. She says his arrest this week amounts to a death sentence.