On June 16, 1991, a tragic event unfolded at the United Bank Tower in Denver, Colorado, resulting in the death of 41-year-old security guard Phillip Mankoff. This incident, known as the Father's Day Bank Massacre, involved a meticulously planned bank robbery that claimed the lives of four unarmed security guards, including Mankoff.
The perpetrator, disguised and possessing detailed knowledge of the bank's layout, entered the building around 9:14 a.m. He first encountered guard William M
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