SAN RAFAEL (CBS SF/BCN) — San Rafael police arrested a landscaper Wednesday after his 42-year-old co-worker was found dead, officers said.

David Nunez Sanchez of Pittsburg didn’t come home after working on a job at an apartment complex on North Avenue in San Rafael on Tuesday, authorities said. The next day, a co-worker from the Concord-based landscaping company Nunez Sanchez worked for went out to the job site and found his work truck, which was locked, according to police.

READ MORE: COVID Vaccines: San Mateo County Reaches 1 Million Shots On Eve Of Full Reopening

The employee called police, who learned that Nunez Sanchez had been reported missing to Pittsburg police on Tuesday after not returning home. When officers searched the truck, they found his cellphone as well as his lunchbox with uneaten food in it, police said.

Officers searched the area and eventually found Nunez Sanchez’s body buried under brush and branches. Detectives went to Concord to interview three other employees who were at the job site that day and learned Nunez Sanchez was the supervisor of the work crew, police said.

READ MORE: Man Accused Of Hacking Santa Cruz County Website In 2010 Arrested After Years On The Run

Miguel Jimenez Alejandre (Marin County Sheriff’s Office)

After an extensive interview, one of the employees, 33-year-old Bay Point resident Miguel Jimenez Alejandre, allegedly confessed to killing Nunez Sanchez. Police have not released the manner of death or a possible motive for the killing.

Alejandre was booked into Marin County Jail on suspicion of murder. Anyone with information about the case is asked to call San Rafael police at (415) 485-3000 or go online to http://www.srpd.org/tips.

MORE NEWS: Man Shot, Suspect at Large In South Park Neighborhood of San Francisco SoMa

© Copyright 2021 CBS Broadcasting Inc. and Bay City News Service. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.