But according to a lawsuit filed in St. Louis, Raiffie is now refusing to reward the person who helped investigators crack the case.

For more than a decade, Raiffie was haunted by the unsolved murder of his son. There were few clues as to whom was responsible for the 1999 shooting and brutal beating death of his son, Mark.

So, Raiffie decided to take action into his own hands by offering up a $250,000 reward for information leading to the arrest of his son's murderer.

The offer worked. According to the St. Louis Post-Dispatch, in 2011 an anonymous tipster contacted investigators and named 38-year-old Willie McNeil as the culprit.

McNeil recently received a 20-year sentence after pleading guilty to second-degree murder in the killing.

But a recently filed lawsuit claims Raiffie is not following up on his promise to pay out $250,000 to whomever led police to the killer.

According to Courthouse News Service, the lawsuit filed by the still anonymous tipster claims Raiffie never paid the reward.

In the suit, the tipster claims he was willing to come forward, despite great personal risk, because he expected to be rewarded, "Plaintiff has received death threats and is subject to further prejudice, harassments, emotional distress, threats, physical harm, bodily injury or even death as retaliation."

The tipster is seeking the $250,000 reward, plus interest since the time he came forward to investigators back in 2011.