Real life murder or suicide puzzle

Alexis jumped off the top of building a suicide attempt not knowing that a safety net is already there near the 8th floor. However, he was interrupted by a bullet shot at the back of head fired near the 10th story window. Alexis falls on the safety net but was dead at the instance.
Normally if a person intends to commit suicide and his actions cause his death, it is a suicide even if the death does not take place in the way the person expected. 
But if it's not the bullet Alexis must have survived.

Later on, investigation police found out that an old man angrily fired at her wife in the 1oth floor flat. however, shot missed the wife and hit the Alexis.
Normally, when a person intends to kill one human being and by his action kills another human being accidental, the charge is murder.

Later on the investigation, it was found out that gun was always unloaded and the man is just threatening his wife Further investigation revealed that the shotgun had been loaded by the couple's adult son, who was angry at his mother for cutting off monetary support. The son was hoping one day his father accidentally killed his mother
Normally when a person plans something whose action kills another human being, the charge is murder.

Note: We have changed the name of the people involved.

Is this a murder or suicide and if murder who is guilty? 

Solution:
Explanation:
The death was ruled a suicide.