"Fifteen minutes of fame" refers to someone no one had ever heard of previously but who gained a reputation (good or bad) which has been exposed to many through the media such as TV news reports, newspaper stories, some sort of sensational action, etc. See https://en.wikipedia.org/wiki/15_minutes_of_fame. Some people now strive to have that fifteen minutes of fame.

"In the spotlight" refers to someone who is standing in the limelight on stage and is very noticeable--the center of attention. McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

Putting them together, you could say: "He's had his 15 minutes of fame and may be arrested now because he's under the spotlight."

"Fifteen minutes of fame" refers to someone no one had ever heard of previously but who gained a reputation (good or bad) which has been exposed to many through the media such as TV news reports, newspaper stories, some sort of sensational action, etc. See https://en.wikipedia.org/wiki/15_minutes_of_fame. Some people now strive to have that fifteen minutes of fame.

"In the spotlight" refers to someone who is standing in the limelight on stage and is very noticeable--the center of attention. McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

Putting them together, you could say: "He's had his 15 minutes of fame and may be arrested now because he's under the spotlight." Or, "He's had his 15 minutes of fame and may be arrested now that he's under the spotlight."