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.

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:

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,