Morgan Dunn, 34, died following an altercation within a property in Ayr on Saturday.
Margaret Grant, 79, died in hospital following a disturbance at her home in Edinburgh last Friday.
Two other people were injured in the crash in Aberdeen on Tuesday last week.
The man was struck near Buccaneer Service Station on the A941 north of Elgin at around 6.20am on Saturday.
Emergency services were alerted to the collision on the A908 in Clackmannanshire on Thursday morning
Officers are looking for information about the car involved, which was heading towards Avoch in the Highlands.
The 91-year-old woman and two other people were hurt in the crash in Aberdeen.
The serious crash happened in Aberdeen on Sunday evening.
The 47-year-old man was pronounced dead after being struck by the silver Seat Ibiza on Sunday.
When officers arrived at the crash site in Midlothian, no one was in the car.
