ST. PAUL, Minn. (AP) _ Ask Gov. Rudy Perpich if he's dyeing his once-gray hair and you get an answer somewhere in the gray area.

''It's the sun,'' the 58-year-old governor, who recently returned from vacation in Hawaii, told a WCCO-TV interviewer who asked about his hair color. ''It's all the sun. Take a vacation. It does wonders.''

But when pressed further on the matter, Perpich said, ''People have been asking if my wife is my daughter, so enough is enough.''

Perpich spokesman Gerry Nelson said Friday he didn't know for sure.

''In the campaign season, it was definitely gray, and now it's definitely not gray,'' Nelson said.

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TOKYO (AP) - Soviet rock star Stas Namin joined U.S. and British singers Saturday in kicking off a two-day benefit concert modeled after last year's U.S.-British ''Live Aid'' show.

Rockers Peter Gabriel and Howard Jones, as well as Nona Hendryx, Jackson Browne, Rebecca, Takako Shirai and the Crazy Boys performed at the Jingu baseball stadium, said Shigeru Yoshida, spokesman for Japan Aid, the group organizing the event.

Namin, who has sold 30 million records in Eastern Europe and the Soviet Union, is the only Soviet rock star whose group has toured abroad, organizers said.

Organizers hoped to raise $1 million for the Japan UNICEF Association and the Tokyo-based United Nations University, as well the University for Peace, a United Nations academic institution in Costa Rica.

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LITCHFIELD, Conn. (AP) - Actor Dustin Hoffman and the caretaker of his Roxbury estate are being sued over the death of the caretaker's girlfriend, who drowned in a hot tub Aug. 24.

A. Joseph Fionda, a relative of the victim, Sheila C. Fionda, filed suit Friday. The lawsuit named Hoffman and caretaker Albion Dudley, but didn't specify the relationship between Joseph and Sheila Fionda.

The suit said Dudley and Fionda went to dinner on Aug. 23, became intoxicated and returned to Hoffman's estate, where she got into the hot tub and was found dead about 90 minutes later.

The lawsuit said that while Hoffman was not home at the time, he failed to fence the hot tub, failed to ensure that the water didn't get too hot and did not instruct Dudley about safe use of the hot tub.

Hoffman's publicity agent, Michael Hecht of the New York firm Hecht & Co., was not available for comment Saturday.

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WORCESTER, Mass. (AP) - An associate dean who objected to Holy Cross College students hiring Watergate conspirator G. Gordon Liddy for a lecture series says he opened a floodgate of criticism.

''I've had more calls from faculty members pro and con and more students making appointments about this than any other issue I've dealt with in my 8 1/ 2 years here,'' said Peter Simonds, who oversees student activities at the Jesuit campus.

Liddy is being paid at least $5,000 by the student Cross and Scroll Society to lecture March 18 on government behind closed doors.

''What notoriety he has is based on the fact that he's a convicted felon,'' Simonds said Friday. ''His credibility in being able to speak about how government runs is weak at best.''

Cross and Scroll Society chairman Nicholas De Palma said a poll of students found the majority favored Liddy's talk. ''We think he can teach us not only about government, but also about history,'' he said.

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CALGARY, Alberta (AP) - Steve Fonyo, the one-legged runner who crossed Canada to raise money for cancer research, is planning to marry a woman he met while on his cross-country trek last year.

Fonyo, 22, and Wendy Reeder, 20, of Strathmore, Alberta, are going to have the largest wedding the small community just east of Calgary on the Trans- Canada Highway has ever seen, Reeder's mother, Judy Pethick, said Friday.

She said the couple wants to invite about 400 guests.

Fonyo completed the 14-month Canadian trek in May 1985, raising $10.5 million for cancer research.