Father of 18-year-old killed in Times Square crash writes emotional letter to daughter

Alyssa Elsman, 18, a tourist from Michigan, was killed last Thursday.

— -- The father of 18-year-old Alyssa Elsman, who was killed when a driver plowed into a crowd in New York's Times Square last week, wrote an emotional letter to his daughter, saying, "I have a hole in my heart that can never be filled."

The framed letter was placed at a memorial near the crash site.

"My world changed when you came into it and it is unexplainable with you leaving it," wrote Thomas Elsman, father of Alyssa Elsman, a tourist from Michigan who was killed last Thursday when a driver sped into a crowd in Times Square. Alyssa Elsman's 13-year-old sister was among the 20 people injured in the crash.

He wrote that his daughter "loved Times Square."

"She would appreciate all your kind words but she would also tell us all to get back up and continue," he added.

Read the full letter here:

The suspected driver, 26-year-old Richard Rojas, was taken into custody at the scene of the crash after he plowed through pedestrians from 42nd Street to 45th Street. He was arraigned on charges of murder, attempted murder and aggravated vehicular homicide. Rojas was remanded to custody and will next return to court on May 24. He has not yet formally entered a plea. His defense attorney declined to comment.

ABC News' Emilie Richardson contributed to this report.