There are many unknowns surrounding the death of 31-year-old Christopher Bagley of Walker, who went missing for 76 days before authorities found his body buried March 1 in southeast Cedar Rapids.Authorities haven’t explained how the property where Bagley’s body was buried is connected to him or their investigation.Court documents reveal four people with connections to Bagley have been arrested for drugs, firearms and burglary, but not for his death.Linn County Sheriff Brian Gardner said this week he couldn’t say if his department was close to an arrest, only that the investigation continues.Here’s a look at what is known so far in the case:Bagley goes missing• On Dec.