CHICAGO (CBS) — A man has been charged with shooting another man to death Sunday morning in the South Loop.

Robert Burgess, 56, has been charged with first-degree murder for the 10:04 a.m. shooting in the 1800 block of South Michigan, according to Chicago Police.

William C. Smith, 45, of the 1900 block of South Indiana, was found in an alley with a gunshot wound to the head, according to police and the Cook County medical examiner’s office.

Smith was pronounced dead at the scene at 10:19 a.m., and his death was ruled a homicide, according to the medical examiner’s office.

A witness told investigators they had heard an argument and then a single shot, police said.

Burgess, who lives in the 6200 block of South Kimbark, was arrested at 10:20 p.m. Sunday in the 5100 block of South Wentworth after he was identified as the shooter, police said.

He was expected to appear in bond court Tuesday.

(Source: Sun-Times Media Wire © Chicago Sun-Times 2016. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)