Solution:

It is not Richard because if it was, Richard 1 and Morgan 3 would both be false, which would make Richard 2 and Morgan 2 both true which is a contradiction.

It is not Travis because if it was, Travis 1 and Travis 3 would both be false, which is not possible.

Therefore, the killer must be Morgan.

Solution:

The murderer is Jack.

Christopher is the seer so exclude him.
Now, if Danny was murderer, then Garry should have been killed.
Now we know that Garry was blocked. Therefore he cannot be the murderer.
Harry can't be the killer as he was killed himself.
This leaves with Jack.

Solution:

Upon reaching each room, he found out that the window facing the dead body was closed. He had to open the window himself. This tells that there was somebody else with him who closed the window. If he would have committed suicide, at least one window would have been open.

Solution:

The husband had booked two tickets for departure and only one for the return. The travel agent told this information to the police and they immediately came to know that he had planned the murder right from the beginning.

Solution:

In this picture, he saw another man. If you try to look near the right end of the picture, you will find a fan. Go down for the phone that is plugged on charge. Go further down and you will find a man's face. An eye is particularly visible. The man was hiding behind the bed when the husband arrived in her room. This made him believe that his wife was cheating on him.

Solution:

AMAN

Explanation:
The numbers actually corresponds to the months of the year.

4 - April
5 - May
8 - August
11 - November

Now when you combine the initials of these months, you will get the killer's name i.e. AMAN

Solution:

The guy threw a boomerang in the air from his window. It flew away and looped around to return back with high velocity. It hit his head and he died on the spot due to the injury. This can be the only logical explanation.

Solution:

The forest in which the body is found was on fire. Thus a fire fighting plane was appointed on the task of putting off the fire. The plane went to the nearest lake and scooped up the water to put on the fire. Accidentally while scooping up the water, they also picked up the man swimming in the lake. Unfortunately they did not know the fact and dropped him on the fir along with the water. He died on the spot.

Solution:

The blood came from a mosquito. It bit and sucked my blood last night. It then flew and sat on the ceiling. Determined to kill it I swatted it right there and the minuscule splatter came from it only.

Solution:

The man had jumped from an aircraft and when he tried opening his parachute, he was unsuccessful. He hit the ground crushing all his bones and died on the spot. The unopened package found near his body is the parachute.