Do you believe that black magic has done this?

I was told story that some witches came to Church claiming to be Christians,and used to be witches but have gotten saved recently.They used to hang around the church alot helping out,and all until one day the pastor Daughter died in horrible car crash few months later.The pastor wife claim that the holy spirit told her that they Christians that used to hang around the church were really evil witches that Satan used to take their daughter soul.When she died the so called ex witches then left never were they heard of again.I was told that sometimes some people who are into witchcraft will sometimes go to church in order to break them up,and put negative energy on them.I not saying this is what the mainstream witches do but i do believe that maybe sometime few of the fringes group will do bad things for evil stake,and christians churches have also do likewise over the years.Do you think i am right or wrong?