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A Buffalo man, previously convicted in four knifepoint robberies, was found guilty Monday in a fifth one and could face life in prison.

After deliberating less than an hour, a State Supreme Court jury convicted Shawn Sivertson, 52, of first-degree robbery for the Nov. 4 holdup of a 7-Eleven store at 3211 Main St., near Winspear Street, in Buffalo’s University Heights neighborhood.

Assistant District Attorney Michael Felicetta said Sivertson had a knife when he approached the clerk and demanded money. When the clerk did not open the cash register, Sivertson took money from a collection box for cancer victims.

Sivertson’s criminal record includes five previous felony convictions in the last 33 years, including the four knifepoint robberies, according to District Attorney Frank A. Sedita III.

Sedita said he will request State Supreme Court Justice Christopher Burns sentence Sivertson as a persistent felony offender at the Nov. 13 sentencing, which, if granted, would mean Sivertson could face 25 years to life in prison.