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Police have arrested a man suspected of fatally stabbing 18-year-old Heather Quast last month.

Cristian Alzaga, 19, was arrested in Palm Springs, Calif., on Friday, after being identified as the primary assailant in the three-man attack. Alzaga is set to be extradited to Salt Lake City where he will face felony first-degree homicide and aggravated robbery charges, said Detective Shannon Bennett of the Taylorsville Police Department. That agency, along with the U.S. Marshal's Office and California police, apprehended the man.

Taylorsville police, the Metro Gang Unit, U.S. Marshals and the Unified Police Department on May 28 arrested Jose Jesus Neri, 19. He was booked into the Salt Lake County jail on suspicion of first-degree felony homicide, first-degree felony aggravated robbery and second-degree felony aggravated assault.

Police were still searching for a third suspect, Cristian Garcia, in the May 26, Jordan River Parkway killing. Garcia, 21, is described as 6-foot-2, 250 pounds. Police do not know where he last lived or the type of vehicle he drives.

The stabbing was believed to have occurred during a drug deal. Quast was stabbed in the abdomen with a 3-inch knife and her boyfriend, Eric Russom, 21, was slashed near his eye. Russom said he had planned to sell marijuana to Neri, but when he and Quast arrived, the three men attempted to steal Quast's purse, which held the marijuana. She also had a wad of cash for a new apartment in her pocket, Russom has said.

Detectives also were still searching for the knife used in the homicide, along with the victim's purse and wallet.

The purse is white with several peace signs printed on it and her pink wallet was inside.

If anyone has information regarding the incident or the purse, they may contact Taylorsville's dispatch center at 801-743-7000.