The man again sought to get warm and dry off Tuesday inside another business. When the business owner checked on him 45 minutes later, he found the man unresponsive and called 911.
The homeless man was pronounced dead at a hospital. His name has not been released.
An autopsy was being conducted to determine whether his death was caused in any way by the injuries he suffered in the January 12 attack, which was caught on surveillance video.
Three people have been arrested and charged in the case. A fourth suspect is still being sought.