Kim Richards

May Not Return

to 'Housewives'

2/1/2011 10:54 PM PST BY TMZ STAFF
Kim Richards may not return to the cast of "Real Housewives of Beverly Hills" ... so her sister said during a taping of "Ellen" today.

Sources close to Kim tell TMZ .... her substance abuse problem has been an issue dogging her and her family for years ... and when Ellen asked Kyle Richards if Kim was returning to the show, Kyle said, "I don't know yet."

T0201_kim_richards_video_smallMZ obtained a video which we ran Friday ... showing Kim drunk at an airport last summer.

The "Ellen" episode airs tomorrow.