Timothy William Costello, 59, passed away on May 26, 2026, in Peoria, AZ. Born on January 12, 1967, Timothy was known for his strong sense of morals and ethics, and his deep love for his family.
Timothy proudly served in the United States Army, carrying the values of duty and integrity throughout his life. He was a devout Roman Catholic, actively participating in church activities.
He graduated from LakeVille High School before pursuing higher education at the University of Michigan-Flint, and later at Arizona State University, where he earned his Bachelor’s degree. Timothy had a passion for politics. He also enjoyed fantasy and science fiction, and playing Dungeons and Dragons, which reflected his imaginative and strategic thinking.
Timothy is survived by his mother, Madeline Costello; siblings Stephen (Cynthia) Costello, Julie (Brian) Halleck, Catherine (Frederick) Perakovic, and Sean (Elisa) Costello; along with many nephews, nieces, great nephews, and great nieces. He was preceded in death by his father, Billy Costello, and his nephew, Stephen Costello.
Memorial services for Timothy are currently being planned. Timothy’s commitment to his family and community will be deeply missed by all who knew him.