People, do you know the various types and kinds of kamma?
Nothing will happen without a cause or reason, you do not get
chronic sickness or rich or poor for no reasons, bear that in
mind.
Kamma got long term, short term and medium term kamma.
You might not have done the bad deed in your previous life, but
what abt your many many previous existences. Kamma might not reap
immediately as in next life, can be subsequent lives later
on.
Who is to say you have killed a man in your 500 lifetime ago and
the kamma ripens only in this life.
Only a Buddha, Maha Bodhisattvas and an arahants can understand the
workings of kamma. Kamma is not easily understood, in fact it is
abstract.
