Flagstaff, AZ – Peter R Tosi 65, died on July 18, 2025 at Flagstaff Medical Center. He was born March 17, 1960 in Tucson, AZ, the son of Peter D Tosi and Jeanne (Bowser) Tosi.

Peter graduated from Mountain View High School in Mesa, AZ in 1978. He attended the University of Arizona where he played baseball.  He transferred and graduated from Arizona State University in 1985. He married Margaret Lewis in 1984, and they were married for 40 years until the time of his death. He served in the US Army as an infantryman. He earned the Expert Infantryman's Badge, airborne and air assault qualifications, and a ranger tab among many other awards.  He retired as a lieutenant colonel. He went on to work for the state of Arizona and retired. Peter enjoyed camping, hunting, and working outdoors. He coached his children in baseball and softball for many years.

He was predeceased by his parents. Surviving is his sister, Kathleen Tosi. He is also survived by his wife Margaret (Lewis) Tosi. In addition to his wife are his son Dominic Tosi and his wife, Andrea, of Savannah, GA; daughters, Vivien Bong and her husband Trevor of Flagstaff, AZ, Rachel Tosi and her husband, Nathan Zamora, of Scottsdale, AZ, Mary Tosi and her husband, Davis Kors, of Washington, DC, and Georgia Tosi of Flagstaff, AZ; two grandchildren, Walker Bong and Bernadette Tosi.

Funeral service will be at 10 am on Friday August 1st, 2025 at San Francisco de Asis church, 1600 E Route 66, Flagstaff, AZ, 86001. Burial will be at AVMC at Camp Navajo at 12:30 pm at 14317 Veterans Dr, Bellemont, AZ 86015. Arrangements by Lozano's Flagstaff Mortuary.