- Charge carries possible death sentence

- 19-year-old thought to have shot himself in throat

- He is 'sporadically' answering questions in writing, sources say

- Details emerge of tycoon's letter for 'forgiveness'

- Tycoon was found dead by bodyguard on Saturday

- Police say it is wrong to speculate on death until post-mortem results

- Nuclear specialists examine his property

- They declare it safe after a radiation detector was triggered