A Silver Spring man who was shot by a robber Saturday while walking his dog died of his injuries last night at a hospital in Baltimore, Montgomery County police said.

Luis Sequeira, 46, of the 10000 block of Markham Street, was walking his poodle about 7:45 a.m. Saturday when he encountered an armed robber who had just held up a Safeway supermarket in the 100 block of University Boulevard West, police said. The victim was shot several times in the chest area and collapsed on the sidewalk.

Sequeira was taken to the Maryland Shock Trauma Center in serious condition, but his condition worsened yesterday afternoon, officials said.

A suspect, identified by police as Shawn Anthony Bowman, 32, address unknown, was arrested in the neighborhood after a brief chase with police.

Bowman was charged with attempted first-degree murder, armed robbery and use of a handgun in the commission of a felony, officials said. Police said the Montgomery County state's attorney's office would move this week to have the attempted murder upgraded to first-degree murder.

Police said the Safeway had been open for about 45 minutes when a man armed with a handgun walked in and ordered a cashier to hand over money. After the cashier emptied a cash register, the robber ordered the cashier to take him to the manager's office, where he took more money, police said.

The suspect fled through a side neighborhood behind the store, where he encountered Sequeira, police said. Officials did not disclose how much cash was taken from the store, and police could not say yesterday whether Sequeira and his assailant exchanged words before the shooting.

Neighbors reported hearing pops of gunfire and found Sequeira lying face down on the sidewalk, moaning and bleeding from several gunshot wounds.

Staff writer Brian Mooar contributed to this report.