Rochester, MN (KROC-AM News) - Court records show a man identified by Rochester Police as the victim of a suspicious death earlier this week was sent to prison for an attempted murder conviction in 2011.

Police say the body of 38-year-old Robert Dumond was discovered Wednesday afternoon amid some piles of gravel and rocks in a vacant industrial lot in the 800 block of Civic Center Drive. Officials say he had been dead a number of days, but the exact time of his death is unknown. Police also say the cause of his death is still under investigation and have indicated the circumstances of his death are suspicious.

Dumond was given an over 6 year prison sentence in June 2011 after he entered a guilty plea to a charge of first-degree attempted murder for trying to smother his girlfriend with a pillow in January 2010.

The Police Department wants to hear from people who may have had contact with the man on or around June 20th. Dumond was initially reported as a missing person on June 23rd, but his last known contact with friends and relatives was on the evening of the 20th. Investigators believe he had been dead for several days before his body was discovered, but the exact time and date of death are not known. Dumond was known to frequent shopping areas along North Broadway, including Silver Lake Foods and Northbrook Plaza. He did not have a vehicle and often traveled on foot or by bus.

Anyone with information should contact the Police Department by calling 507-328-6800 or call Crime Stoppers at 1-800-222-TIPS.