Now, he wants the public to know about a memorial fund you can contribute to, in his daughter's memory.
"This was her beach, and she spent her last moments on this beach," said MacKay.
Court records say Olivia MacKay met Daniel Tate online, and then met in person at Pennoyer Park. Jamari Cook told investigators he came with, and witnessed Tate strangle MacKay, and hold her body underwater.
"How could something like that happen in such a public area?" said MacKay, who is still grieving his daughter's loss. He told us Olivia was inspired to become an international journalist, after studying abroad in China her sophomore year at Indian Trail High School.
He says Olivia had planned to study abroad in France, at the same time she was murdered.
"There was one student that wasn't able to go to France and it held up the whole group from the school the whole group couldn't go to France," said MacKay.
This is why MacKay set up a fund in Olivia's memory, called Olivia Mackay Memorial Fund. It will help pay for future students at Indian Trail High School to travel abroad. He hopes the fund will eventually help students in the entire Kenosha Unified School district.
"Part of the reason why we're setting it up is so that that doesn't happen again if a student needs to go or has the desire to go and study abroad that this fund is being done to help make that happen," said MacKay.