St. George police
St. George police are looking for Mario Alfonso Lucero, 31, in connection with an assault that resulted in the death of Jeramy Shawn Olsen, 31.

ST. GEORGE — Police are searching for a man wanted in an alleged assault that has now ended in the death of another man.

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Jeramy Shawn Olsen, 31, died Sunday while being treated at University Medical Center in Las Vegas. He was flown there Saturday after receiving critical head injuries during an altercation with another 31-year-old man, according to St. George Police Capt. Kyle Whitehead.

A alleged gang member, Mario Alfonso Lucero, 31, is wanted for questioning related to the incident. Lucero is believed by police to be armed and dangerous and has ties to the Utah communities of St. George, Washington, Ivins and Hurricane, as well as others in New Mexico, Mesquite, Nev., and southern California.

A warrant has been issued for Lucero's arrest. Anyone with information about his whereabouts is asked to call St. George police at 435-627-4300.

Wendy Leonard, Twitter: wendyleonards