TORONTO -- The sisters of a Toronto teen who was gunned down in front of his home earlier this month called on the gunman to "man up" and turn himself in to police.

Roshea Gunnis, one of Jarvis Montaque's sisters, broke down in tears as she spoke about her only brother, saying he didn't deserve to be taken away from his family.

Calling her 15-year-old brother an "amazing person", Montaque's eldest sister -- Tanasha Smith -- appealed for information to help police solve his killing.

The sisters' emotional plea today came as Toronto police announced a new Crime Stoppers campaign to encourage people to report crimes anonymously.

Montaque was shot at close range on Feb. 17 while socializing with friends and family in front of his home in the city's west end and police say the gunman simply walked away afterwards.

Det. Gary Giroux says any witnesses with information should come forward to help investigators solve the killing of Montaque, who was the fourth minor to die in gunfire in the Toronto area this year.

Police have described Montaque as a "good kid" who was living with his family while going to school. The only boy in a family with 10 sisters, he came to Canada from Jamaica two years ago and was not known to police.

The new campaign will feature posters encouraging people to use Crime Stoppers to report crime without having to disclose their identity. The messages will be distributed throughout the city's police divisions and electronically at local Mac's stores.