Little wonder was it that this remarkable combination of circumstances directed suspicion against O'Sullivan, especially when it was further remembered that he was seen in conversation with the mysterious tenants of the Carlson cottage. Analyzed once more the case against him was considered quite as strong, even if not stronger than that against the detective. Accordingly it was decided to place both men under arrest. Early on the morning of May 27th O'Sullivan was notified that his presence was desired at the Lake View Police Station. When he responded he found himself a prisoner. During the day an information was sworn out by John Joseph Cronin, the brother of the physician, charging Coughlin and O'Sullivan, together with a number of persons whose names were unknown, with the murder of Dr. Cronin. Upon this information warrants were issued, and shortly before midnight Coughlin was arraigned before Justice Kersten at the Chicago Avenue Station, to the bar of which the detective, during his four years of service, had brought many scores of prisoners. Yet, even in this critical hour, he did not seem to feel his position, but smiled and chatted pleasantly and in a light hearted manner, with his former companions on the force. No evidence was submitted, the prosecution requesting a postponement, and by agreement the case was adjourned for a week, an application for the admittance of Coughlin to bail being peremptorially refused. A patrol wagon conveyed the detective to the County jail and here he was assigned to Cell 25, in what was known as "Murderers' Row." While these proceedings were being taken, O'Sullivan, at the Lake View Station, was being closely interrogated by Captains Wing and Schaak, Lieutenant Schieuttler and Squire Boldenbeck, who at that time was mayor of the little town. The latter, who had considerable influence over the iceman, urged him to tell all that he knew, but the prisoner was stubborn, and it was only by dint of persistent questioning that he was led to confess that he had known Coughlin for years, that, although he had persuaded Justice Mahoney to introduce him to Dr. Cronin, he had met the physician before, that he (O'Sullivan) was a member of the Clan-na-gael in good standing; and that he had talked with the Frank Williams who had rented the assassin's den. More than this he would not say, and, much to his own surprise, he found himself within an hour the occupant of a cell adjoining that of Detective Coughlin in the County Jail. INDICTED BY THE GRAND JURY.