Published: Dec 02, 2013 6:44 PM EST
Updated: Dec 02, 2013 6:54 PM EST

FORT MYERS, Fla.- A mother is pleading for answers in her son's unsolved murder from seven years ago in Fort Myers.

Police say they found 31-year-old Joshua Kent shot and killed while sitting in his car off Royal Palm Avenue in May 2006. But without witnesses coming forward or strong evidence, the case remains unsolved.

Kent's mother, Debbie Harrison, says time doesn't make the pain go away. "If you look around you think, how could somebody not have heard this or saw something? It just doesn't make sense to me that there are cold hearted people walking the streets here. Someone knows something," she says.

"Doesn't matter if he was perfect or not, nobody has that right to take someone's life," Harrison says. "He was a father and his son is growing up without him and that hurts."

Fort Myers Police Detective Emily Destefanis says, "this is one of the most difficult types of crimes because it was not an immediate discovery of the victim, and unfortunately that reduces many instant leads that would come in so we're starting behind the 8 ball out of the gate. The main key is to remind people. It's very unbelievable to me that a gun shot could go off in the middle of the night in front of a apartment complex in a residential area and have nobody hear it."

She says she's always looking for new ways to turn up leads. "I do believe there are people out there who heard or saw something, whether they are friends to our suspect or suspects that know things, it's imperative that we try to locate them. An avenue that I've tried to be very active with- when I arrest people, no matter who it is- just speak to them. Ask if they remember this crime, if they have any information, it's important to continue to ask people because you never know what answer you'll get," she says.

Harrison is frustrated with what she calls unanswered questions, but police say they are doing everything they can to bring her family justice. She says, "the person who did this to my son, how would you feel if it was your child? How can you live with yourself and look in the mirror everyday without seeing my son's face?"

Destefanis adds, "these families have a hard time moving on and it's never done for them, and until we can do something for them, it's not done for us either."

There are 22 unsolved murders from last year and so far this year in Fort Myers.

You can receive a $25,000 reward for information that leads to an arrest and conviction in a murder case.