The suspect stabbed the victim during an argument, then fled the scene, police said.
The MTA opened the new 50th Street Commons as part of the larger East Side Access project.
NJ Transit commuters faced delays of up to 30 minutes Wednesday morning.
The eight Long Island Rail Road unions reached a deal with the MTA Thursday.
An Amtrak power outage stalled their own trains and New Jersey Transit lines, officials said.
The 1, 2, 4, 5, 6, 7, E, F, G, L, N, Q, R and S lines will be affected by construction this weekend.
The Eighth Avenue chain restaurant will close on Sept. 7, according to a filing with the state.
A freight train derailed in Jamaica Wednesday afternoon.
The LIRR and New Jersey Transit both reported disruptions after a wire fell in Penn Station.
Flames erupted inside a vacant shop under construction on 34th Street near Penn Station, the FDNY said.
A fire near Penn Station disrupted subway lines for hours and prompted evacuations, officials said.
The fire broke out on tracks leading into Penn Station Friday evening, the fire department said.
The flash mobs usually take up three subway cars, the organizer said.
Service changes will also affect Empire Service between New York City and Albany.
The rail agencies won't let straphangers bring alcohol onto its trains Saturday afternoon through Sunday.
Get Our Daily New York Newsletter
Thank you for signing up!
Would you like to sign up for additional newsletters?
Thank you for signing up for additional newsletters.