The last moment he saw his daughter is an image Steve Sicola can't get out of his head.
"That will never...it will always haunt me," Sicola said.
Sicola found his 20-year-old daughter strangled to death inside her apartment near Austin Bluffs and Academy in Colorado Springs.
"That was a day that, if I take it one piece at a time, I can't handle it at all. That visual will never leave."
That was May 2, 2013. Three years later, Angelina Sicola's murder remains unsolved. It's the only unsolved Colorado Springs murder from 2013.
A lot of mystery continues to surround the case. Springs police have released very few details about her murder. They have never said if she knew her killer, but tell us there was no forced entry into her home.
Sicola says his daughter was supposed to meet him at the doctor's office that day. The first sign something was off came when his older daughter said Angelina didn't show up to swap a parking pass.
"I called [Angelina]. My first instinct was....she did like her sleep."
When Sicola got to the doctor's office, he was told Angelina had never checked in.
"I'm like, 'This is really weird,' and I tried to text her again...nothing. Called, got her message. I'm thinking, 'Hmmm.'
"So I went over to her apartment, and as I went there, I started having the panic...of what could be."
Sicola knocked, and went inside when his daughter still didn't answer.
"It seemed like no one was there, but she was there.
"The first thing that hits is shock, and I think I, after screaming at the top of my lungs for probably a couple of minutes...I called Amber [his other daughter]...told her Angie's dead, and she was like, 'No, no, no, no, you have to wake her up.'
"We went downstairs and proceeded to lose it."
Sicola told us that his daughter, known as Angie to her loved ones, was always by his side. He described her as an incredible young woman who was in her second year at UCCS and worked at the US Taekwondo Center. She had an unshakeable bond with her sister.
"At some point I’m sure they'll find the perpetrator but it doesn't take away from the fact that she's gone from this earth,” Sicola told us. "Evil is there, and given the fact that she was so strong, I would say whoever it was, was also a coward."
Family members raised $10,000 through crowd funding as a reward for information leading to Angie's killer. If you have any information, call CSPD at 444-7000, or to stay anonymous, Crime Stoppers at 634-STOP.