The NYPD solves thousands of cases each year — but a handful of others prove difficult to crack, even with hours of investigative work and the help of media attention.
This past year was no exception.
Here’s a look back at some of the notable criminal cases of 2021 that remain unsolved:
Seven-year-old Julissia Battles was found with trauma to her head and body on Aug. 10 inside a Bronx apartment. She was rushed to Lincoln Hospital but died, police at the time said.
Initially, the girl’s mother had told investigators that Julissia had fallen around 5 a.m. and hit her head on a desk, cops said. Around 8 a.m., the girl started vomiting and passed out.
An autopsy revealed the tragic girl — the subject of a heated custody battle between her mother and paternal grandmother since birth — died from “blunt force abdominal trauma,” according to officials.
Julissia’s 17-year-old half-brother later allegedly admitted to assaulting the girl before she was found dead, but neither he — nor anyone else — was ever charged.
A man was fatally shot outside a bustling Brooklyn subway station in Williamsburg earlier this month, police said.
Cops said at the time they believed the Dec. 10 act of gun violence, which occurred at the bottom of the steps of the Marcy Avenue station, was “drug-related.”
Cops are still hunting the killer of 34-year-old Augustin Santiago.
Thai model brutally robbed
Thai model Bew Jirajariyawetch was punched in the face and put in a headlock before being robbed on in Manhattan subway station in late November — a stunning act of violence that was caught on camera.
The 23-year-old was standing on the edge of the B/D/F/M platform at the 34th Street-Herald Square station on Nov. 22 when she was attacked from behind.
Days later, a startling video emerged showing the moment her attacker put her in a chokehold and beat her.
“I’m just glad that I’m still alive,” she later told The Post.
Cops have yet to catch up to her attacker.
Home invaders duct-tape victims, steal pricey jewelry
Two robbers busted into a Bronx apartment back in September, bound their victims with duct tape and made off with thousands in cash and high-end jewelry, including a pair of Rolex watches.
The home invaders followed a 34-year-old woman into her home the Mount Eden home at East 170th Street and Grand Concourse just after 8 a.m. on Sept. 27, cops said.
One of the men pistol-whipped the 37-year-old man inside and taped the victims’ hands and mouth before making off with the Rolexes, four gold chains and $30,000, cops said.
Police are still hunting for the men.
Gunman opens fire outside nightclub, striking innocent victims
An irate club guest opened fire outside a Bronx nightclub in July — striking three people partying inside, cops said.
The shooting broke out just before 4 a.m. on July 11 outside a club at 1324 Jerome Ave. after the unknown man pulled a gun after a fight with the bouncer, cops said.
Three innocent people — a 30-year-old man, a 32-year-old woman and an unidentified man — were struck by the gunfire but survived, police said.
The gunman took off into the 167 Street/Grand Concourse subway station and remains in the wind.