SOUTH JORDAN, UT — A second man previously charged in the case of missing 15-year-old Alisa Petrov has turned himself in, and authorities have now arrested a third suspect in connection with the ongoing investigation.

According to a press release from the South Jordan Police Department, Matthew Nicholas Menard, 32, of Miami, Florida, self-surrendered on the evening of May 28. Menard, who had been communicating with Alisa via Instagram prior to her disappearance, is charged with aggravated sexual exploitation of a minor, enticement of a minor, and criminal solicitation. He has been booked into the Salt Lake County Jail.

In a significant development, police have also arrested a third suspect, identified as Samuel Mitchell, 41, of Herriman, Utah. Mitchell has been charged with sexual exploitation of a minor and is also being held in the Salt Lake County Jail. His connection to Alisa or the other suspects has not yet been publicly detailed.

This comes after investigators uncovered digital evidence linking Menard and another suspect, William Taylor Glines of Texas City, Texas, to explicit communications with Alisa before she went missing on April 21. Glines faces several charges, including attempted aggravated exploitation and enticement of a minor.

Alisa was last seen on surveillance video exiting a UTA train in Provo just before midnight on April 21. Witnesses reported that she had been asking about how to travel to Las Vegas.

She is still considered a runaway juvenile, but police have classified her as missing and endangered. Law enforcement agencies across Utah, Florida, and Texas continue working together to locate her and follow new leads.

A $20,000 reward remains in place for verifiable information leading to Alisa’s safe return.

Anyone with information is urged to contact the South Jordan Police Department immediately.