LONG BEACH - Police today officially reopened the cold case of a murdered teenage rabbinical student in Long Beach.

Officials in Nassau County said this morning that they are increasing the reward for information leading to the arrest of Chaim Weiss' killer to $25,000. Weiss’ murder has gone unsolved for more than 26 years.

Weiss was 15 years old when he was beaten and stabbed multiple times at an Orthodox Jewish Yeshiva in Long Beach in 1986.

Officials say there were no signs of forced entry into a dorm where he slept at Mesivta of Long Island.

Weiss’ family joined police during the announcement and his father, Anton, appealed for someone to come forward.

Police have said since the start of the investigation that they found very few clues that might lead them to a killer. Police added that they hope renewed publicity could jog someone's memory of what may have happened.

For more on unsolved murder, watch the clip to the left or click News 12 Extra on Optimum TV channel 612.