Walls of pictures of murder victims - many of their killers still not caught. Now .. there's a push to solve these cold cases across our state. 3 Hundreds of families are awaiting answers on who killed their loved one. Now ... a local man is devoting his time and energy to try to help these families. He's started a petition to solve cold cases .. and he's getting support from a local state senator. Channel 4's Hailey Winslow has been looking at this petition which you can find on Change- dot-org .. Hailey, what did you find? 3 3 if you go through and read the reasons why people have signed this petition, it's just heart-breaking..."My son was murdered and I still don't know why." "I'm the mother to a hit and run death of my son, still unsolved." "my brother was murdered in a house fire." There are so many people out there who just want answers... 3 0-1014-20In 2009, Cliff Backmann was vacuuming this newly constructed office building on Bonneval Road on the Southside...It was a Saturday afternoon, and he was trying to make extra money... Someone went in, shot him in the back, and stole his wallet... With no witnesses or leads, the case quickly went cold...4 and a half years later, Crime Stoppers is still offering tipsters a $13,000 reward... And his son, Ryan Backmann is still left without answers... Backmann started working for the non-profit Compassionate Families, and quickly realized how many cases are similar to his dad's...More than 1400 unsolved homicides in jacksonville since 1960... ...To help get these murderers locked up, Backmann started a petition last week, already with close to 500 signatures... He's asking legislators to consider forming a statewide cold case task force and review team made up of homicide experts from the attorney general, state attorney, sheriff, and medical examiner's offices...along with victim advocates and victim family members...He's also hoping to develop a state-wide database of all unsolved homicides for the public and law enforcement to use. Arizona and Colorado have started something similar, and it's already proven successful. 3 The really sad The really sad part is, often times police officers know who committed the murder but they don't have enough evidence to arrest the person...That's why investigators rely so heavily on tips from the public and anonymous calls to Crime Stoppers, at 866-845-TIPS... ...They need someone who can provide that KEY piece of evidence so they can make the arrest.If you'd like to sign the petition, go to CompassionateFamilies.org, and it's right there on the homepage.We put a link to it on our website, news4jax.com.