Laura Wigglesworth (Kellie Shanygne Williams) is the main villainess from Family Matters' third season finale, "Farewell, My Laura" (airdate May 8, 1992). She is the main villainess in Steve Urkel's short story under the same episodic title.
The story takes place in the fall of 1946, with Laura entering the office of private eye Johnny Danger (Urkel), hiring him to protect Laura's aunt, Rachel Crawfish (the owner of The Supper Club). Danger appeared at the club and performed his investigation, where he was introduced to Rachel by Laura. Laura resurfaced and served a drink to Danger, only for Danger to discover (too late) that it was spiked, causing him to be knocked out. By the time Danger woke up, he found Rachel with a knife in her back, stabbed to death.
The climax saw Danger at the Wigglesworth home, interrogating the family as well as Chef Waldo (who worked at the club) and Lt. Murtaugh. With every interrogation, lightning crashed and each person was shot to death, and after Officer Wigglesworth was the last person shot, Laura was shown smirking evilly and brandishing a gun, revealing herself as the true killer.
After his dramatic narration, Danger (barely) wrestled the gun from Laura's possession, and regarding a motive, the evil Laura stated that she wanted to inherit The Supper Club, hence why she killed Rachel (doing so after drugging Danger). As for her other victims, Laura killed them because she was last in line for the inheritance. Danger later confessed to being infatuated with Laura, so much so that he gave Laura two options: either run away with Danger or head to jail. Laura took the latter, phoning police that she committed several murders, leading to a pair of officers taking her into custody.