No 'life after death'. We are Homo sapiens - simply animals with a higher level of intelligence. Just as amoebas, ants, haddock, llamas and such don't have a heaven, hell or other such place, neither do we. Sightings, experiences or feelings about so called spirits, entities or ghosts are caused by the human brain being easily deceived, confused and convinced. Deceiving and/or confusing and/or convincing factors can be individual or sometimes combined aspects including tiredness, alcohol, other drugs, poor visibility, preconception, optical illusion, pranks, deliberate deception, peer pressure and some humans need to 'spice up' a story.
The 'other world' falls in to the same category as religion. When it is examined in any depth it is revealed to be bogus and without foundation other than blind faith.