"I love Maria. I would never lay a finger on her. And, it hurts me to know her killers are gone," said Thaddeus Pietrak.
He opened up Thursday evening. Candid on camera, overcome with passion, he shared his frustration over the investigation into the murder of his sister, Maria Lockrow, and her husband Michael Allen Lockrow.
"They're never going to find these people that killed my sister and my brother in law," he said.
The Lockrows were beaten to death Wednesday morning. So far, police have no suspects in custody, no person of interest. Although, they have questioned several people, including Pietrak.
"I believe I still am a person of interest. And, this is why I'm furious," he said.
Pietrak claims he hasn't had contact with his sister since January 2012. He says that was when Maria had obtained an order of protection against him.
"I was accused of assaulting my sister Maria in 2012. When police took me down, I had no problem with them understanding that I would be a person of interest because of the assault charge in 2012," he said.
Despite being accused of assaulting her, Pietrak shared memories of his sister.
"My sister was always there for me. Always offered a kind word, always offered a word of support," he said.
Police are now focusing on the couple's missing blue 2013 Ford Escape-which they believe two male suspects may be driving. As police their continue their investigation, Pietrak remains steadfast in his innocence.
"I had the privilege of giving my sister away on her wedding. But, yet, I'm accused of her murder? I certainly did not do this crime."