Munoz was last seen in the 11000 block of First Avenue southwest in Tukwila, Washington April 29, 2011. His father heard him come home at 2:00 a.m. and go to bed. His father saw Munoz briefly later that morning before he left for the day. Munoz has never been heard from again. He was reported missing on May 5.

Munoz was unemployed at the time of his disappearance and didn't have a vehicle. His cellular phone disappeared with him and was left on for a number of days afterwards, but although numerous calls were made to the phone, no one ever answered it. Munoz's father, whom he was very close to, got sick and died in the year after he went missing. Munoz is considered missing under suspicious circumstances and foul play is suspected in his case.