DENVER (CBS4) – Police are investigating the killing of a clerk at a 7-Eleven store.

(credit: CBS)

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It happened early Friday morning at 17th Street and Welton Street early Friday morning.

Derek Sorenson, 29, was killed by a sharp object, according to Denver’s coroner.

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Police put out a surveillance picture of the suspect they are looking for.

(credit: Denver Police)

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Authorities so far haven’t released a motive for the killing.