ST. FRANCISVILLE -- A jury chosen in St. Tammany Parish convicted Angola inmate David Brown, 38, of first-degree murder Thursday in the beating and stabbing death of Louisiana State Penitentiary security Capt. David C. Knapps in 1999.

The jury of eight women and four men deliberated for about an hour and 15 minutes before returning the unanimous verdict before Judge Jerome M. Winsberg in a West Feliciana Parish courtroom.

Prosecutors from Jefferson and Caddo parishes, acting on behalf of the 20th Judicial District Attorney’s Office, are seeking the death penalty against Brown, who is serving a life sentence for a 1992 murder in Jefferson Parish.

Testimony is expected Friday in the penalty phase of Brown’s trial as the jury decides whether to give him the death penalty.

A unanimous verdict is required for a death sentence.

Knapps, 49, was killed during an armed uprising by at least six Angola inmates who wanted to escape from the prison’s Camp D on Dec. 28, 1999.

Inmate Joel Durham was shot to death when prison officers rescued two other hostages, and a West Feliciana Parish grand jury indicted Brown and four other inmates for first-degree murder.

Inmate Jeffrey Cameron Clark was sentenced to die after being found guilty of first-degree murder in May. Another jury convicted Robert G. Carley of first-degree murder, but jurors were unable to unanimously agree on a sentence. Winsberg then sentenced Carley to another life sentence.