Food for thought.
Web of Spider-Man (Vol. 1) #3
Published: c. March, 1985?
Cover Date: June, 1985
“Iron Bars Do Not a Prison Make…”
Writer: Louise Simonson
Artist: Greg LaRocque
Inker: Jim Mooney
Letterer: Phil Felix
Colorist: George Roussos
Food for thought.
Web of Spider-Man (Vol. 1) #3
Published: c. March, 1985?
Cover Date: June, 1985
“Iron Bars Do Not a Prison Make…”
Writer: Louise Simonson
Artist: Greg LaRocque
Inker: Jim Mooney
Letterer: Phil Felix
Colorist: George Roussos
Lifelong fan of Spider-Man. My secret identity is Adam S.
Hope everyone has a great day today. Amazing Spider-Man (Vol. 1) #172 Published: c. June, 1977? Cover Date: September, 1977 “The Fiend from the Fire!” Writer: Len Wein Artist: Ross Andru Inker: Frank Giacoia Letterer: […]
“Polish my button” is a line for the ages. Amazing Spider-Man (Vol. 1) #116 Published: c. October, 1972? Cover Date: January, 1973 “Suddenly… The Smasher!” Writer: Stan Lee and Gerry Conway Artist: John Romita Inker: […]
Not bad for an amateur! Amazing Spider-Man (Vol. 1) #155 Published: c. January, 1976? Cover Date: April, 1976 “Whodunit!” Writer: Len Wein Artist: Sal Buscema Inker: Mike Esposito Letterer: Irving Watanabe Colorist: Glynis Wein


I mean, technically, MJ didn’t “figure it out”. She just happened to be looking out her window and saw Spider-Man come out of Peter’s bedroom.
If X in a murder mystery just happens to overhear Y monologuing about how they are the murderer, then X didn’t *solve* the murder – they just stumbled upon the key information.