Was it reversible error to introduce defendant's inculpatory statement obtained without Miranda warnings?

QUESTIONS PRESENTED I. WAS IT REVERSIBLE ERROR VIOLATING THE PETITIONER'S CONSTITUTIONAL RIGHT TO HAVE DUE PROCESS OF LAW DURING CLOSING ARGUMENTS TO INTRODUCE HIS INCULPATORY STATEMENT MADE TO POLICE, WHERE DEFENDANT'S STATEMENT WAS OBTAINED WITHQUT THE BENEFIT OF MIRANDA WARNINGS AND IN VIOLATION OF HIS RIGHT AGAINST SELF-INCRIMINATION? II. WAS THE DEFENDANT DENTED HIS STATE AND FEDERAL CONSTITUTIONAL RIGHT TG HAVE THE ASSISTANCE OF COUNSEL, WHERE TRIAL COUNSEL FAILED TO OBJECT DURING THE PROSECUTOR'S TO INTRODUCTION OF TRE DEFENDANT'S INCULPATORY STATEMENT MADE TO POLICE AS THE STATEMENT WAS QBTAINED WITHOUT THE BENEFIT OF MIRANDA WARNINGS AND IN VIOLATION OF HIS RIGHT AGAINST SELF-INCRIMINATION? di