No cause of death given. Jackson was best known for BJ and the Dirty Dragon on WFLD/32 and the nationally syndicated Gigglesnort Hotel on WLS-TV/7. Hoosiers "of a certain age" may also remember his show on WLWI/13 in the early 1960s. RIP, Bill. 
wgnradio.com
Remembering Chicago children’s television legend Bill Jackson
Chicago children’s television legend Bill Jackson has died at age 86. He was known for a series of shows including Cartoon Town, BJ & the Dirty Dragon and Gigglesnort Hotel and characters…