Brother's suicide

Almost twelve years ago, my brother, Dan Watkins was found in his business dead. He was shot point blank in his chest and he died a slow death with bird shot and he bled to death. My brother had a lot of trouble with the Moline, Illinois Police department and I feel that they were quick to shut the case down and not investigate it in its entirety. You had to have know my brother. He was a very vane man. He had to stop and look in the mirror whenever he ran across one. He also was a exotic dancer and I don't feel my brother would have done that to his body. He also called my mother to his place of business to assist in the operations of his personal owned business. He was having trouble running the back business and answering the phones so he asked my mother to come in and run the office for him. When she arrived that morning the shop was secured and that was not normal. He was always there early and he had the shop opened by the time she had gotten there in the past. When they arrived at the shop, they entered through a back door. One of my brothers employees went into the basement of the business and came back up the stairs shocked. My brother was shot. They called the Moline Police Department and they were eager to list my brothers death as a suicide. But in my heart and in my head he would not have done that to himself or to his family. Not knowing all these years has not given me or my siblings any closure. If anyone has any knowledge of this case I would appreciate it. His name was Daniel T. Watkins, he was born on Sept. 28th, 1952. His place of business was D.A.D.'s auto detail. Please if anyone knows anything please help us get some closure on this matter.