IQ puzzle or answer: Suicide victim or assassinated?

Question 1. A beautiful morning, wealthy businessman Luke was found dead at his home. Detective identifies 3 main suspects: Oliver, Jason and Adam. They all have a motive for causing problems, but always insist that they are not the culprits. Only Adam and Jason seemed worried during the interrogation. Before breathing off, the victim wrote the line "1491011" on the wall calendar. According to you, who is the culprit really?

Question 2. Mr. Mark was murdered in a one-story wooden house. Mr. Tracy, Mr. Mark's wife, informs Detective Bourne about the case. She provided the detailed address, directions for the detective to come to the scene easily. Detective Bourne parked outside the house and knocked on the door. Mrs. Tracy opened the door, invited the detective to come to the drawing room. Upon entering the house, Bourne heard a strange noise upstairs. Tracy said, "Don't mind. Helping is cleaning the room on the first floor." According to you, is Bourne the suspect who is the culprit?

Question 3. Sunday afternoon, Mia is home alone. She invited a few friends to come and talk. 20 minutes later, Mia is mysteriously murdered. The police rushed to the crime scene and interrogated Mia's friends there. Mary said: "I haven't had lunch at home yet, so I was eating in Mia's kitchen." Emily asserted: "All day, I swim in the pool." Nancy said: "I'm in the room, painting". Noah said, "I walked around the house." The police are very confused, because these statements seem reasonable. Before making a final conclusion, they suggested checking the suspects' hands. Can you guess who killed Mia?

Question 4. Receiving a body of a man lying at the foot of the largest building in the city, the police rushed to the scene. Detective walks into the first floor of the building, entering the room with a window facing the body discovered. He opened the room window and did the same until the top floor. According to you, is this a suicide or assassination?