Prawut said it was initially found that there was some irregularity in the share transfer, but it could not be confirmed yet if it had anything to do with Chuwong's death.
In a related development, the Securities and Exchange Commission is also investigating this case and gathering information from the securities firm in question, according to SEC assistant secretary-general Paralee Sukonthaman.
"The investigation must be careful and comprehensive. Much progress has been made. We are coordinating with the police, but it will take about three months before we can disclose findings," she said.
There have been calls for the stock market's regulating body to look into this case seriously.