Relatives of Singh spoke about their loss and called for answers as police continue searching for a suspect.
Police say the victim had no prior interaction with law enforcement.
The value of the drugs is said to be about $900,000, officials said.
Investigators say 30-year-old Shakeema Davis was found with multiple stab wounds in Lincoln Terrace Park in Crown Heights.
Police say the victim, a 52-year-old woman, was grazed in the left arm, and was taken to Brookdale Hospital where she is expected to survive.