OROVILLE — Four fraternity members pleaded guilty Friday in the death of a California State University, Chico, student who was forced to drink large amounts of water during an initiation rite at an unrecognized Greek house.

The most serious plea of involuntary manslaughter and misdemeanor hazing was entered by Gabriel Maestretti, 22, who was sentenced to a year in jail and five years probation, according to the Butte County District Attorney.

John Paul Fickes, 20, and Jerry Lim, 25, each pleaded guilty to being an accessory to manslaughter and to misdemeanor hazing, while Carlos Devilla Abrille, 22, pleaded guilty to misdemeanor hazing.

Fickes and Lim will serve six months in jail and five years probation. Abrille was sentenced to 90 days in jail and three years probation.

The pleas close a case that began with the death of Matthew Carrington, 21, of Pleasant Hill, who died from cardiac dysrhythmia caused by water intoxication. Prosecutors said Carrington died Feb. 2 after he and another pledge, Michael Quintana, were ordered to drink and douse themselves with water from five-gallon jugs as fans blasted them with cold air in the basement of Chi Tau fraternity.

"I'm glad they stood up and took responsibility for what they did. I'm proud of them for that," Carrington's mother, Debbie Smith, said of the defendants.

Earlier this month, Michael Fernandez, 19, pleaded no contest to hazing and was sentenced to 30 days in jail.

Two other fraternity members — Richard Hirth, 22, and Trent Stiefvater, 20 — still face misdemeanor hazing charges and are scheduled to appear in court Nov. 23.

The president at Chico State banned alcohol and hazing at fraternities and sororities following the Feb. 2 incident. The new policy banned all Chico chapters from recruiting new pledges during the current fall semester so they could incorporate the new rules.