Three people, including a 5-year-old child, were found dead inside an apartment building at 674 E. 136th St. Sunday morning, police say.

According to police, Jonathan Rivera, 38 was found in the building's first floor hallway with a stab wound to his chest just after 6 a.m.

Shortly after that, the NYPD said Hanoi Peralta, 33, and Kayden Rivera, 5, were found dead inside the apartment. Sources have confirmed that all three victims are family members.

A memorial is growing outside of the family's home on East 136th Street and family members are gathering to mourn the loss of their loved ones.

"I just came by today to leave flowers and candy and ballons," said Ana Diaz, Jonathan Rivera's mother. "I just hope tomorrow we have a better sense, they have somebody in mind."

The father of one of the victims tells News 12 that members of the family currently suspect a fellow family member to be responsible for these killings.