ROYAL OAK, Mich. – Monday marks the 20th anniversary of a deadly shooting rampage inside the Royal Oak Post Office.
On November 14, 1991 Thomas McIlvane, a recently fired worker, entered the building with a rifle and opened fire.
The deadly event ushered in the term 'going postal' .
McIlvane shot and killed four people before turning the gun on himself.
Among those killed: 33-year-old Christopher Carlisle of Rochester, 33-year-old Rose Marie Proos of Sterling Heights, 32-year-old Mary Benincasa of Clinton Township, 37-year-old Keith Ciszewski of Livonia
To mark the anniversary several current and former post office employees planned a memorial outside the building, but it was moved inside because some employees said they wanted to remember the moment privately.