Teen subway slash suspect was kicked out of friend’s Bronx pad: ex-pal

One of the accused subway slashers who went on a rampage through the transit system is a former foster child who was crashing at his pal’s Bronx home — until the friend kicked him out, The Post has learned.

Joseph Foster, 18, crashed at friend Jahntonio Grant’s apartment in the Soundview Houses until December, when Grant gave him the boot, he told The Post. Grant, 23, said Foster has no family in the building and was in the city’s foster care system but had signed himself out. He wanted to help the teen because they both went through the foster care system, Grant said.