Police say the man broke into a 28-year-old woman's apartment on East Tremont Avenue last week.
He went up the fire escape, climbed into the victim's third-floor window, pointed a gun at her and sexually assaulted her, according to investigators.
Investigators say the same suspect is linked to a similar attack last November.
Anyone with information in regards to this incident is asked to call the NYPD's Crime Stoppers Hotline at 800-577-TIPS or for Spanish 1-888-57-PISTA (74782)