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Prosecutors have chosen only to file charges against two people involved in the June 9 slayings of a father and his son, despite the fact that others may have been involved in the altercation that led up to the deaths, police said.

Richard Gabaldon, 19, and Fred A. Alvarez, 17, were each charged with two counts of first-degree murder Friday in 3rd Circuit Court in connection with the stabbing deaths of Donald Newingham, 39, and his son, Shane Newingham, 18, both of Salt Lake City.Anthony DeHerrera, 19, was originally booked into the Salt Lake County Jail for investigation of first-degree murder as was an unidentified 17-year-old boy, who was booked into juvenile detention. But prosecutors have chosen only to file charges against Gabaldon and Alvarez, said Salt Lake Police Lt. Marty Vuyk.

Prosecutors said details of the complicated case were difficult to sort out because some eyewitnesses gave detectives contradictory testimony.

The Newinghams and three others went to a party June 9 at 467 Morton Drive, but were denied entry by Alvarez and Gabaldon. A fight ensued involving about 20 people, police said.

Witnesses told detectives they saw Alvarez stab one of the victims and also saw Gabaldon, Anthony DeHerrera and Manuel Alvarez beating the two men, according to a search warrant filed in 3rd Circuit Court. Gabaldon told detectives he and his companions drove to LDS Hospital immediately following the incident to get treatment for Fred Alvarez, who had a knife wound to the leg, the search warrant stated.

Fred Alvarez was expected to be transferred from juvenile detention to the Salt Lake County Jail on Monday.