(Inver Grove Heights, MN)  --  A Saint Paul man who threatened to kill his son's youth hockey coach last December is headed to jail for 180 days.  Fifty-year-old Thomas Tonda was sentenced today  after pleading guilty to one count of terroristic threats.  Prosecutors say Tonda screamed at the coach, put him in a choke hold and verbally threatened to kill him as he left the area.  The incident happened at the ice arena in Inver Grove Heights.  The judge stayed a 21-month prison sentence and ordered Tonda to more than 350 hours of community service.