One of two suspects charged in a series of random shootings that killed seven people in the Phoenix area has pleaded guilty to first-degree murder.

Samuel Dieteman also pleaded guilty to conspiracy to commit murder Friday.

Authorities say Dieteman and former roommate Dale Hausner randomly shot and killed seven people, wounded 17 more and killed several animals. Hausner still faces seven murder counts.

Dieteman and Hausner had been arrested in 2006.