Construction is related to Helmet. Helmet is related to Gear. Reverse is a type of Gear. Reverse is related to Step. 
Killing can cause/lead to Investigation. Investigation is related to Suspect. Suspect is related to Suspicion. 
Construction <--RelatedTo--> Helmet <--RelatedTo--> Gear <--IsA-- Reverse <--RelatedTo--> Step 
Killing --Causes--> Investigation <--RelatedTo--> Suspect <--RelatedTo--> Suspicion 