100+ Detective Riddles Inspired by Sherlock Holmes and Detective Mehul

On the first day of school, someone murdered a history teacher. There were four people at the school that the police suspected had done it: the landscaper, a math teacher, a basketball coach, and the principal. These were their alibis:

The landscaper said he was outside mowing the lawn.
The math teacher said he was giving a mid-year test.
The basketball coach said he was running practice drills with his players.
The principal said she was in her office.

After giving their alibies, Detective Mehul arrested the killer immediately. Who killed the history teacher and how did the police know?

A crime has been committed at Freemont Street. The main suspect is a man named Sean Baker. It was said that a man had been walking along the pathway when he was suddenly shot in the stomach. The suspect had brown hair, and blue eyes and wore a baggy Armani suit just like Sean Baker's. Sean was asked to tell the story right from the beginning. "Well," said Sean, "I was just hanging around the park when I saw this man walking along the pathway. Suddenly, a guy came up from behind him and shot him! I ran home as fast as I could. Detective Mehul asked him to give a description of the murderer. "He had a red mustache, red hair and a baggy Armani suit on."

"I think this man is telling a lie," said one of Detective Mehul's allies. How did he know?

Jagga hanged himself through the ceiling in his ice factory. There was nothing except a small puddle of water in the room. No chair or a table was there to climb up. How did he manage to hang himself?

Jagga lived alone in his flat. Because of his age, he was not able to move out much and hence would spend most of his time home.
On Friday, while delivering the mail, the postman sensed something suspicious in the flat and tried to look inside through the key hole. He saw the dead body of Jagga.
Detective Mehul steps into the crime scene. Outside of the flat, he found two bottles of warm milk, Tuesday`s newspaper, unopened mail and some gifts.                             
Mehul knew exactly who murdered Jagga.

Sanjana was at her mother's funeral when she met a fascinating man and immediately fell in love with him. He vanished before they could exchange phone numbers. She didn't even know what his name was.

Later, she was arrested for the murder of her older brother, Gogo. Why did she murder him?

Jagga killed his wife. He had legal rights to do so. People watched him but, no one could accuse him of his action. Why?

Jagga killed his wife in front of a large gathering. However, no one has the power to claim him for murder and imprison him for his crime. How?

A dead body is seen outside a four-story building. Detective Mehul ran up to the first floor and checked the window. He checked the windows of floors 2nd,3rd,4th, and 5th too. When he came down, he said it wasn`t a suicide but a murder. How?

As Sanjana entered her house and went to hang her coat, when her roommate yelled, "No, John! Do not attempt it!" There was a shot, and she heard her roommate fall. 
When she stepped into the kitchen, she saw the girl and the rifle on the ground. 
A cop, a doctor, and a lawyer were standing nearby. Who murdered Sanjana's roomie, and how did she find out know?

Detective  Mehul  reviewed the information they had on the case so far.
A lady named Martha was found shot and they already had a list of suspects;

The killer was a fan of the Detective and challenged him by leaving notes at various places. The first was found in the compound. The second was found in an art room. The third was in a restroom. The fourth in an underwater room. The fifth at the smoking lounge. The sixth in the makeup room.

Bob,
Teresa,
Peter,
Marcus

All of the notes read the same thing, The clues are where you find the notes. Yet, nothing was found at anyplace the notes were. Can you help the detective Mehul crack this case?