Gunman Shane Tamura fired nearly 50 shots during his rampage on a Park Ave. skyscraper, where he killed an NYPD cop and three civilians before taking his own life — with slightly more shots fired at the 33rd floor office he mistakenly took an elevator to,

When I look into you and dad’s eyes, all I see is disappointment,” Tamura wrote to his mother in the note. “I love you, Momma. I’m sorry.”

NYPD detectives, collaborating with Nevada authorities, are investigating the Park Avenue shooting carried out by Shane Tamura. A search of Tamura's Las Vegas apartment revealed ammunition, medications,