There are no nice men.

Poor Samson.

He was just trying to make an honest, non-Irish mob related living. He had a decent blue collar job. He didn't do drugs, beat people up, extort money from old family friends, gamble excessively, steal cars, kidnap Italians, or accidentally kill disabled veterans. He probably didn't live with his parents. In other words, Samson was a normal, mentally stable guy. But Samson, alas, was unlucky in matters of the heart. And much like the Biblical figure he was named after, he fell victim to love.

When Jenny slept with him that one time, little did he know that she'd only done it to make Tommy jealous. When he caught her trying to sneak out on him before he woke up, he was understandably somewhat hurt. When she told him outright that sleeping with him had been a mistake, Samson was clearly disappointed but not angry. He told her that he respected her decision, and said that he would leave the ball in her court. Because Samson was a nice, normal guy and capable of behaving like an adult regarding his relationships. In real life, having recognized that Jenny loved Tommy, Samson would have moved on and probably found a nice, normal girl who would have loved him back.

But this is not real life, this is The Black Donnellys. And the writers just couldn't leave Samson alone because emotionally stable men do not exist in the Donnelly universe. So poor rejected Samson began acting out of character; he became a crazy stalker who hung around Reilly's Diner and alternated between crying and making threats. In the season finale, Jenny beat him to death with a crowbar, but the real Samson had disappeared many episodes ago. He was the victim of character assassination by the very people who created him.

Oh Samson, we hardly knew ye!