01/26/2011 01:36 pm ET Updated May 25, 2011

More Questions In The Case of Missing Harlem Teen Found Dead

HARLEM -- The mood at the Bronx High School that Gregory Willis Jr. attended has changed with every new development in the story of the missing 17-year-old who was found dead Sunday.

"It's gone from sad to angry and now frustrated. A lot of the kids and staff are angry that we don't know what happened to this young man. It's becoming one of those unsolved mysteries," said Vern Ram, Willis Jr.'s guidance counselor at the Celia Cruz High School of Music.

Willis Jr., described by friends and family as a quiet homebody, was last seen leaving his apartment at the Abraham Lincoln Houses at 2120 Madison Ave. about 4 p.m. on Jan. 19.