Four people were killed and a fifth was injured in a mass shooting at a Midtown Manhattan office building on Monday. The injured victim was an employee at the NFL, according to NFL Commissioner Roger Goodell. Here's what we know about the four people killed:

Family and friends of the four victims killed in the Midtown mass shooting have spent several days mourning and laying their loved ones to rest. It’s believed that 27-year-old Shane Tamura targeted 345 Park Ave.

Investigators are combing through evidence in the wake of New York City’s deadliest mass shooting since 2000, trying to figure out more about the gunman who unleashed an assault-style rifle in Midtown,