LAGUNA WOODS (CBSLA.com) — An emotional memorial service was held Friday for a 28-year-old woman whose body was found in the Cleveland National Forest two months after she was reported missing.

The service was  held for Erica Alonso at 11 a.m. at St. Nicholas Catholic Church in Laguna Woods.

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Alonso was last seen Feb. 15 after leaving her on-and-off again boyfriend’s home in Irvine. Her car was discovered about a mile away from her house a month later.

A group of biologists working for Caltrans discovered her body April 27 in a dry creek bed, located one mile east of the San Juan Capistrano Fire/Ranger Station on the Ortega Highway near Hot Springs Road, according to the Orange County Sheriff’s Department.

An autopsy conducted by the OCSD’s Coroner Division revealed there were no obvious physical signs of trauma.

The cause of her death remains undetermined;  the autopsy was inconclusive and there were no obvious signs of death. Toxicology reports are pending.

CBS2’s Michele Gile attended the emotional service and spoke to Alonso’s father, Isaac.

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“I’m not going to stop, I’m not going to stop until we find out the person who did this,” he said.

Alonso told Gile that he has not spoken to his daughter’s boyfriend since she disappeared.

“We were expecting him to come over and say ‘I’m with you, I wanna help search for Erica and do something.’ I don’t know what happened. He never did that. I don’t know.”

Alonso believes his daughter was the victim of a homicide.

“I am pretty sure that she was murdered by someone,” he said, “I don’t know who. I wish I could have a clue who did this.”

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Anyone with information was asked to contact the Orange County Sheriff’s Department’s Homicide Unit at (714) 647-7055 or (714) 647-7000.